Azbil Model DC 3-Wire Cylindrical Proximity Switches have enhanced circuit protection, including surge absorption, load short circuit, and reverse connection countermeasures. The sensing distance is 1.5 mm to 10 mm, depending on the size. The main unit, Firefly indicator, is available in sizes (O.D.) M8, M12, M12 (long-body type), M18, and M30, with NPN and PNP models available for each. The indicator light can be checked even from the rear. IP67 Sealed.